(Jim Cramer's "Stop Trading!" recap updated with additional quotes from Cramer, as well as insights on the rail industry and Berkshire Hathaway.)

NEW YORK (

TheStreet

) -- Berkshire Hathaway is a buy, Jim Cramer declared during Friday's

Stop Trading!

segment on CNBC.

Berkshire Hathaway, headed by Warren Buffett, completed its purchase of railroad

Burlington Northern Santa Fe

(BNI)

Friday.

"I would be a buyer of Berkshire on Tuesday," Cramer said. "I'm a buyer of

Buffett's company. I happen to love the railroads. So now that

Buffett is overweight in rails, I want to buy it even more," Cramer said.

Aside from Berkshire, Cramer says he likes "every single one of the rails. It's such an efficient way to be able to ship goods."

Cramer specifically called out

Norfolk Southern

(NSC) - Get Report

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, which reported strong earnings on Thursday. "Norfolk Southern reported some pretty amazing things yesterday," Cramer said.

Cramer also says

Union Pacific

(UNP) - Get Report

holds a lot of upside -- he noted that the only downfall to the railroads could be some pending legislation, but he says he believes they will be able to kill the legislation.

Cramer also announced that on tonight's

Mad Money

show, he would have the CEO of

North American Tanker

(NSC) - Get Report

, Herbjorn Hanson on the show.

"I am ... talking about the price of oil with the man who has more ships with oil going around the world, and that's Herbjorn Hanson. This is the guy who understands contango and understands the oil trade. I'm gonna find out whether there's a surplus of oil or not."

""Energy, it's the most important call out there," Cramer continued. "You've got to know where energy is going to be, particularly because Congress is about to take it up, after they get through the morass that is health care."

-- Reported by Jeanine Poggi in New York.

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